jQuery attribute selectors: How to query for an attribute with a custom namespace

Question

Suppose I have a simple XHTML document that uses a custom namespace for attributes:

Answer 1

jQuery does not support custom namespaces directly, but you can find the divs you are looking for by using filter function.

// find all divs that have custom:attr
$('div').filter(function() { return $(this).attr('custom:attr'); }).each(function() {
  // matched a div with custom::attr
  $(this).html('I was found.');
});

Answer 2

This works in some conditions:

$("div[custom\\:attr]")

However, for a more advanced method, see this XML Namespace jQuery plug-in

Answer 3

You should use $('div').attr('custom:attr').

Answer 4

Here is an implementation of a custom selector that works for me.

// Custom jQuery selector to select on custom namespaced attributes
$.expr[':'].nsAttr = function(obj, index, meta, stack) {

    // if the parameter isn't a string, the selector is invalid, 
    // so always return false.
    if ( typeof meta[3] != 'string' )
        return false;

    // if the parameter doesn't have an '=' character in it, 
    // assume it is an attribute name with no value, 
    // and match all elements that have only that attribute name.
    if ( meta[3].indexOf('=') == -1 )
    {
        var val = $(obj).attr(meta[3]);
        return (typeof val !== 'undefined' && val !== false);
    }
    // if the parameter does contain an '=' character, 
    // we should only match elements that have an attribute 
    // with a matching name and value.
    else
    {
        // split the parameter into name/value pairs
        var arr = meta[3].split('=', 2);
        var attrName  = arr[0];
        var attrValue = arr[1];

        // if the current object has an attribute matching the specified 
        // name & value, include it in our selection.
        return ( $(obj).attr(attrName) == attrValue );
    }
};

Example usage:

// Show all divs where the custom attribute matches both name and value.
$('div:nsAttr(MyNameSpace:customAttr=someValue)').show();

// Show all divs that have the custom attribute, regardless of its value.
$('div:nsAttr(MyNameSpace:customAttr)').show();

Answer 5

the syntax for matching by attribute is:

$("div[customattr=bla]") matches div customattr="bla"

$("[customattr]") matches all tags with the attribute "customattr"

with namespace attributes like 'custom:attr' its not working

Here you can find a good overview.